Cap nut



June 19, 1923. 1,459,548

D. B. MORISON CAP NUT Filed Oct. 4, 1921 Fir 1- IN VEA/ TO F DONALD Moe/5on1 Patented June 1;, 1923.

DONALD BARNS MORISON, OF HARTLEJPOOL, ENGLAND.

CAP NUT.

Application filed October 4, 1.921. Serial No. 505,442.

To all whom it may concern:

Be it known .that I, DONALD BARNS MomsoN, a subject of the King of Great Britain and Ireland, residing at Hartlepool,

5 in the county of Durham, England, have invented certain new and useful Improvements in Gap Nuts, of which the following is a specification. v

This invention relates to cap nuts as'used.

for threaded bolts and the like, that is to say, nuts having one end closed.- Such nuts are usually'constructed of solid metal, the cap being integral with the nut;

The invention consists broadly of a two part cap nut comprising a'nut, a cap and a locking member adapted upon the application of pressure mechanically applied to' become so repositioned .or displaced as to integrally unite or interlock the nut and 2 the cap.

In accordance with my invention or one form, I provide on the top of an open ended nut adjacentto the thread an upward extension. In this extension a groove is formed for receiving thecap,which may be a stamped Hollow cap or ,may be'a disc, the base of the cap if desirable being suitably shaped or enlarged to facilitate interlocking. A die being placed over the cap'and resting on the outward lip of-the groove is subjected to applied pressureas by a percussiveblow with the effect that the lip is folded over the enlargement of the base of the cap, and

together with the base of the cap completely:

85 fills the groove, whereby the cap and nut are integrally connected and constitute a complete cap nut as a whole. The outward lip of the groove is preferably so formed that when folded over it embodies aradius to at its base and atop so shapedas to produce an efiective junction with cap.

It will be understood that either or both parts, viz, the nut and the cap, may be otherwise suitably formed so that the interlockt5 ing is made effective by the mechanical displacement of metal resulting from pressure applied as above described or by spinning as in a lathe or in any other suitable Way.

In the accompanying drawings I have illustrated the preferred embodiments of my invention,

Fig. 1 being an elevational view partly in section of acap nut constructed in accordance with the invention;

Fig. 2 a section to an enlarged scale illustrating the two members of the nut with the'die in position ready for operation.

Fig. 3 is a similar view after the die has been operated. I i 1 ig. 4 .is a part sectional elevation of a nut illustrating how the cap may be pro vided with an ornamental veneer. Referring to Figs. 1 to 3 of these draw- 1ngs'the numeral 1 designates the bod portion or nut proper which is forme with an upstanding annular rim or fiange 2- bordering an annular oove or recess 3 into which the separate y formed ca 4 is arranged in the manner shown in ig. 2. Upon the descent of the die 5 the flange 2 becomes mechanically repositioned or displaced from its original form to the position shown in Figs. 1 and 3, the pressure operating to ensure a practically homogeneous structure.

.By means of the foregoing a homogeneous structure can be provided which will be leak proof tinder great pressure and which can be made more cheaply than heretofore, moreover, it enables the cap and the nut to bemade of dissimilar metals, for example, the nut may be made of ordinary steel and the cap of rustless metal or material.

Nuts of the foregoing characterapart fromother advantagescan be made very attractive in-appearance by making the cap member of a metal different from that of the nut member. For example, a blued or heat treated nut with a nickel, duralminium, or other bright metal cap is very attractive and needs the minimum'of labor to keep it clean. The use of these special metals wholly for the cap ma however, be expensive. Aneconomica method of manufacturing such nuts which forms a feature of my invention consists in forming the nut memberand the cap member of comparatively inexpensive metal and applying, as a veneer, to the cap member a thin covering member of themore expensive and attractive metal. A convenient arrangement is illustrated in Figs. 4 wherein the nut and the cap 4 are formed of steel and the cap is enclosed in a thin covering member 6 of nickel-or the like. By this means an equally attractive nut is providedwithout the use of any considerable quantity of the expensive metal. v 7

Moreover, the cap member may be an unmachined stamping in the condition in which outwar 1y it leaves the stamping machine. and the veneer member may be pressed from 5 1s %romoted.

hat I claim and desire to secure by Letters Patent is A. ca nut, comprising a cap having an extending. annular depending base of greater diameter than thebody of rea ers the cap, a-nut having 'an annular recess in which the depending'base of the cap is posi tioned, said recess being bordered by a lock--' ing flange adapted to be mechanically repositioned over the extended baseof the cap whereby the locking flange and the base of the cap are integrally interlocked. In testimony whereof, I afix my signature.

' DONALD BARNS v MORISON. 

